Reenforced metal lath



Sept. 20, 1932. W J, PURSER 1,877,964

REENFORCED METAL LA'IH` Filed Oct. 27. 1950 lll@ i l'HC-Mll PatentedSept. 20, 1932 UNITED STATES musei PATENT y OFFICE WILLIAM J. PURsER,OF'MINERAL RIDGE, OHIO, AssIeNoR To THE BosTwICK STEEL LATII COMPANY, orNILEs, OHIO, A CORPORATION or OIIIO REENFORCRD MRTALl LATH Y Applicationfiled ctober 27,1930. Serial No. 491,544.y

This invention relates to improvements in reenforced metal lath of thenon-expanded type, and has in View toprovide a non-eX- panded metal lathstructure of the corrugated or channeled type including a novelcombination and relative arrangement of reenforcing and plaster keyingformations designed to impart requisite stiffness to the lath and toeffectively hold the plaster thereon, and at the same time to providefor eifecting economy in the use of plaste-r when plastering or coveringthe lath.

With the fo-regoing and other purposes in view, the invention consistsin the novel features of construction and in the novelcombination andarrangement of said features as will be hereinafter more fullydescribed, illust-rated in the accompanying drawing and defined in theappended claims.

In the drawing, wherein like characters of reference denotecorresponding parts in the different views Figure 1 is an outer faceview of a section of metal lath fabricated in accordance with thepresent invention.

Figure 2 is a perspective view of a section of the lath.

Figure 3 is a longitudinal section on the line 3-3 of Figure 1.

Figure 4 is a transverse section on the line 4-4 o-f Fig. 1; and

Figure 5 is a transverse section on the line 5-5 of Fig. 1.

The sheetmetal body or base of the present lath, designated in thedrawing as A, is o-f corrugated or channel form, or, in other words, iscomposed of a plurality of parallel ribs 10 and a depression 11 betweeneach adjacent pair ofy said ribs, said ribs and depressions beingcontinuous longitudinally from end to end of thebase kor body A andpreferably being of materially greater width than depth, with the ribsslightly exceeding' the depressions in width.

Stiffening beads 12 preferably are formed along the top of each rib- 10at the ysides thereof, respectively. Preferably, too, transverseStiifening formations or beads 13 are formed at evenly spaced intervalsalong each rib 10 between and connecting the beads 12. Thus,

the top of each rib 10 isdivided by the transverse beads 13 intoaplurality o-f shallow depressions or plaster seats 14, each of which, inaccordance with the invention, is longitudinally slitted adjacentto thebeads12, 12, respectively, as indicated at 15, and has the metal betweensaid slits press-ed together and arched outwardly to provide aso-calleditruss loop16. Y v

Formed at longitudinally spaced intervals along thebottomof eachdepression 11 are transverse stift'ening ribsv or beads17, and betweeneach adjacent pair of saidl ribs'orV beads the metal of the bottoms ofsaid de pressions 11 is longitudinally slittedy adjacent to the sidewalls of the depressions, as indicated at 18, to provide, between eachpair of said slits, a flat band-like formation 19 which is archedoutwardly as shown. f v

Preferably the beads 17 of the several depressions 11 are disposed inparallel rows transversely of the body or base A, as also are the'beads13 of the ribs 12, and, as shown, the rows of beads 13 preferably aredisalined with respect to the rows of beads 17 so that the truss loopslare staggered with respect to the arched, band-like reenforcingformations 19. Thus, the inherent rigidity and strength of the channeledbase or body A is materially enhanced by the trussfloop formations 16and the'arched bands 19, with the resulty thatl lthe present.non-expanded metalY lathv fabrication*V possesses.l great strength andstiffness both longitudinally and transversely and any possibility ofthe samer buckling of partaking of an undulating or wave motion whenplaster is applied thereto is substantially eliminated.

C When the sections of metal comprising both the truss loop formations16 and the Hat band-like formations 19 are arched outward it followsthat the edges of the .metal adjacent to theslitsl and 18 arespreadapart so that the Originally narrow slits take the form'ofgrelativelywide openings through which plaster may pass from one side to the otherof the'lath sheet. This is particularly true with respect to the slitsat either side ofthe respectivetruss loops 16 dueto pressing togetherfofthe metal of said truss loops,

but with respect to the arched bands 19 which are flat, it will be notedthat the width of the openings provided by vthe slits 118 to either sideof each of said formations is relatively narrow, so that in applyingplaster to the lath sheet considerably less plaste-r is permitted topass through the slits or openings 15. Thus, the present lath providesfor effecting a saving in plaster as is manifest, particularly ascompared with a lath in which all of the reenforcing or truss loopformations have the form of the truss loop formations 16, and at thesame time the present combination of reenforcing formations impart tothe lath the desired and requisite stiffness and strength.

Obviously, in view of the foregoing, the arrangement shown might readilybe reversed by providing the ribs 10 with the flat band-like formations19 and providing the depressions 11 with the truss loops 16; or, boththe ribs 10 and the depressions 11 might be provided with band-likeformations similar to the formations 19 without appreciably sacrificingstiffness and strength of the lath sheet in o-rder to provide for amaterial saving in plaster.

Without further description it is thought that the features andadvantages of the invention will be readily apparent to those skilled inthe art, and it will of course be understood that changes in the form,proportion and minor details of construction may be resorted to, withoutdeparting from the spirit of the invention and scope of the appendedclaims.

I claim 1. A metal lath structure comprising a sheet of metal corrugatedto provide alternate parallel rib and depression formations, the metalof each of said formations being longitudinally slitted at spacedintervals to provide reenforcing bands, the bands of certain of saidformations being arched longitudinally and squeezed together to providetruss loops, and the bands ofl the other of said formations being archedoutwardly and being continuously flat throughout their respectivelengths.

2. A metal lath structure comprising a sheet of metal corrugated toprovide parallel ribs and a depression between each adjacent pair ofsaid ribs, each rib being longitudinally slitted at longitudinallyspaced intervals to provide reenforcing formations, said formationsbeing arched longitudinally and squeezed together to provide trussloops, and the bottom of each depression also being longitudinallyslitted at spaced intervals to provide other reenforcing formations, thelatter formations being arched longitudinally and being transverselyflat. v

3. A metal lath structure comprising a sheet of'metal corrugated toprovide parallel ribs and a depression between each adjacent pair ofribs, a stiifening formation along the top of each rib at each sidethereof, truss loop formations at longitudinally spaced points along thetop of each rib between the stiffening formations thereof, andtransversely flat longitudinally arched bands pressed from the bottom ofeach depression at longitudinally spaced intervals.

In testimony whereof I hereunto affix my signature.

WILLIAM J. PURSER.

